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		<title>three.js webgl - lights - spotlight</title>
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		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - spotlight<br />
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

			import { PLYLoader } from 'three/addons/loaders/PLYLoader.js';
			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';

			let renderer, scene, camera;

			let spotLight, lightHelper;

			init();

			function init() {

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				document.body.appendChild( renderer.domElement );

				renderer.shadowMap.enabled = true;
				renderer.shadowMap.type = THREE.PCFSoftShadowMap;

				renderer.toneMapping = THREE.ACESFilmicToneMapping;
				renderer.toneMappingExposure = 1;

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 0.1, 100 );
				camera.position.set( 7, 4, 1 );

				const controls = new OrbitControls( camera, renderer.domElement );
				controls.minDistance = 2;
				controls.maxDistance = 10;
				controls.maxPolarAngle = Math.PI / 2;
				controls.target.set( 0, 1, 0 );
				controls.update();

				const ambient = new THREE.HemisphereLight( 0xffffff, 0x8d8d8d, 0.15 );
				scene.add( ambient );

				const loader = new THREE.TextureLoader().setPath( 'textures/' );
				const filenames = [ 'disturb.jpg', 'colors.png', 'uv_grid_opengl.jpg' ];

				const textures = { none: null };

				for ( let i = 0; i < filenames.length; i ++ ) {

					const filename = filenames[ i ];

					const texture = loader.load( filename );
					texture.minFilter = THREE.LinearFilter;
					texture.magFilter = THREE.LinearFilter;
					texture.colorSpace = THREE.SRGBColorSpace;

					textures[ filename ] = texture;

				}

				spotLight = new THREE.SpotLight( 0xffffff, 100 );
				spotLight.position.set( 2.5, 5, 2.5 );
				spotLight.angle = Math.PI / 6;
				spotLight.penumbra = 1;
				spotLight.decay = 2;
				spotLight.distance = 0;
				spotLight.map = textures[ 'disturb.jpg' ];

				spotLight.castShadow = true;
				spotLight.shadow.mapSize.width = 1024;
				spotLight.shadow.mapSize.height = 1024;
				spotLight.shadow.camera.near = 1;
				spotLight.shadow.camera.far = 10;
				spotLight.shadow.focus = 1;
				scene.add( spotLight );

				lightHelper = new THREE.SpotLightHelper( spotLight );
				scene.add( lightHelper );

				//

				const geometry = new THREE.PlaneGeometry( 200, 200 );
				const material = new THREE.MeshLambertMaterial( { color: 0xbcbcbc } );

				const mesh = new THREE.Mesh( geometry, material );
				mesh.position.set( 0, - 1, 0 );
				mesh.rotation.x = - Math.PI / 2;
				mesh.receiveShadow = true;
				scene.add( mesh );

				//

				new PLYLoader().load( 'models/ply/binary/Lucy100k.ply', function ( geometry ) {

					geometry.scale( 0.0024, 0.0024, 0.0024 );
					geometry.computeVertexNormals();

					const material = new THREE.MeshLambertMaterial();

					const mesh = new THREE.Mesh( geometry, material );
					mesh.rotation.y = - Math.PI / 2;
					mesh.position.y = 0.8;
					mesh.castShadow = true;
					mesh.receiveShadow = true;
					scene.add( mesh );

				} );

				window.addEventListener( 'resize', onWindowResize );

				// GUI

				const gui = new GUI();

				const params = {
					map: textures[ 'disturb.jpg' ],
					color: spotLight.color.getHex(),
					intensity: spotLight.intensity,
					distance: spotLight.distance,
					angle: spotLight.angle,
					penumbra: spotLight.penumbra,
					decay: spotLight.decay,
					focus: spotLight.shadow.focus,
					shadows: true
				};

				gui.add( params, 'map', textures ).onChange( function ( val ) {

					spotLight.map = val;

				} );

				gui.addColor( params, 'color' ).onChange( function ( val ) {

					spotLight.color.setHex( val );

				} );

				gui.add( params, 'intensity', 0, 500 ).onChange( function ( val ) {

					spotLight.intensity = val;

				} );


				gui.add( params, 'distance', 0, 20 ).onChange( function ( val ) {

					spotLight.distance = val;

				} );

				gui.add( params, 'angle', 0, Math.PI / 3 ).onChange( function ( val ) {

					spotLight.angle = val;

				} );

				gui.add( params, 'penumbra', 0, 1 ).onChange( function ( val ) {

					spotLight.penumbra = val;

				} );

				gui.add( params, 'decay', 1, 2 ).onChange( function ( val ) {

					spotLight.decay = val;

				} );

				gui.add( params, 'focus', 0, 1 ).onChange( function ( val ) {

					spotLight.shadow.focus = val;

				} );


				gui.add( params, 'shadows' ).onChange( function ( val ) {

					renderer.shadowMap.enabled = val;

					scene.traverse( function ( child ) {

						if ( child.material ) {

							child.material.needsUpdate = true;

						}

					} );

				} );

				gui.open();

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function animate() {

				const time = performance.now() / 3000;

				spotLight.position.x = Math.cos( time ) * 2.5;
				spotLight.position.z = Math.sin( time ) * 2.5;

				lightHelper.update();

				renderer.render( scene, camera );

			}

		</script>

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